On 2016-09-24 20:19:29 +0000, Alastair said:

On Saturday, 24 September 2016 16:09:26 UTC+1, Asha Santon wrote:
On 2015-08-06 14:52:07 +0000, Alastair said:

Cold radiation does exist.

Cheers, Alastair.

I am not arguing or taking sides (hard to believe, I know) but please
consider this.

Place an ice cube on a suitable surface (use tongs to protect your
body heat) and move your forefinger near to it until you feel the
cooling effect. This is caused by:

a) The cold is radiating from the ice cube, causing your fingertip to
feel less warm than before, or

b) The warmth from your finger is radiating towards the cooler ice
cube, causing your fingertip to feel less warm than before.

Then try this.

Put a kettle on to boil and move a fingertip towards the body of the
kettle until you feel the heat (taking great care not to burn
yourself). This is caused by:

c) The heat is radiating from the kettle, causing your fingertip to
feel warmer than before, or

d) The relative cold from your finger is radiating towards the kettle,
causing your fingertip to feel warmer than before.

The explanations for each outcome must agree, in other words you may
choose (a) and (d) as the answer or (b) and (c). Other combinations
would be self cancelling and therefore incorrect.

No advanced physics, no references to abstruse web sites, just a
simple experiment that we can all do and probably have done by chance
many times.

--
Asha
nature.opcop.org.uk
Scotland

Asha, the correct pair are a and c. In the case of both the ice cube
and the kettle the radiation from your finger does not change. So how
can it be an agent?

If my hands are cold and you kindly place your warm hands either side
of my cold hand (not touching) my hand will absorb warmth from yours.
Yours will not absorb cold from mine. Fingers radiate and that
radiation varies constantly (unless you are seriously ill).

Why is it when one offers someone two choices, they always pick a third
non-existent option?

I repeat, "you may choose (a) and (d) as the answer or (b) and (c)."
Choose an option available to you. I am making the offer; you do not
get to invent options for yourself.

--
Asha
nature.opcop.org.uk
Scotland